As far as new levels/mods/patches, I believe the answer is a firm no. I/we have given LEC several opportunities to take us up on possible add-ons, and their response has been consistently unenthusiastic.
Emailing LEC would probably have little to no effect upon them, as their resources are completely reallocated from TPM onto other things. Without allocated resources, nothing gets done in a big company like that.

I'm working on one-and-a-half semi-secret projects right now Doing model/rigging work for a project based on a certain MTV property (don't ask/don't tell), and also doing some hoping that we're gonna land an Xbox conversion of a PS2 game, 'cuz that game is gonna be a BLAST. Reminds me of TPM on many levels with regards to gameplay, but with a totally different license.